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参数资料
| 型号： | MAX8740ETB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | IC CONV DC-DC TFT-LCD 10-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.6 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 2.6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
TFT-LCD Step-Up DC-DC Converter
Pin Description
PIN
1
2
3
4, 5
6, 7
8
9
10
NAME
COMP
FB
SHDN
GND
LX
IN
FREQ
SS
FUNCTION
Compensation Pin for Error Amplifier. Connect a series RC from COMP to ground. See the Loop
Compensation section for component selection guidelines.
Feedback Pin. The FB regulation voltage is 1.24V nominal. Connect an external resistive voltage-divider
between the step-up regulator’s output (V OUT ) and GND, with the center tap connected to FB. Place the
divider close to the IC and minimize the trace area to reduce noise coupling. Set V OUT according to the
Output Voltage Selection section.
Shutdown Control Input. Drive SHDN low to turn off the MAX8740.
Ground. Connect pins 4 and 5 directly together.
Switch Pin. LX is the drain of the internal MOSFET. Connect the inductor/rectifier diode junction to LX and
minimize the trace area for lower EMI. Connect pins 6 and 7 directly together.
Supply Pin. Bypass IN with a minimum 1μF ceramic capacitor directly to GND.
Frequency-Select Input. When FREQ is low, the oscillator frequency is set to 640kHz. When FREQ is high, the
frequency is 1.2MHz. This input has a 5μA pulldown current.
Soft-Start Control Pin. Connect a soft-start capacitor (C SS ) to this pin. Leave open for no soft-start. The soft-
start capacitor is charged with a constant current of 4.5μA. Full current limit is reached after t = 2.5 x 10 5 C SS .
The soft-start capacitor is discharged to ground when SHDN is low. When SHDN goes high, the soft-start
capacitor is charged to 0.4V, after which soft-start begins.
L1
V IN
2.7 μ H
D1
V OUT
4.5V TO 5.5V
C1
10 μ F
6.3V
R3
10 ?
C3
1 μ F
8
9
6
LX
IN
FREQ
MAX8740
7
LX
2
FB
GND 5
R1
196k ?
1%
R2
20k ?
1%
C2
10 μ F
20V
C7
10 μ F
20V
13.5V/800mA
3
SHDN
GND
4
10
SS
COMP 1
C6
33nF
R4
47k ?
1%
C5
68pF
C4
560pF
Figure 1. Typical Operating Circuit
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相关代理商/技术参数 |
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| MAX8740EUB+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX8741EAI | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX8741EAI+ | 功能描述:电流和电力监控器、调节器 500kHz Multi-Out Pwr Supply Controller RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX8741EAI+T | 功能描述:电流和电力监控器、调节器 500kHz Multi-Out Pwr Supply Controller RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX8741EAI-T | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
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